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Stability of Carbocation

Stability of ...

Question

Stability of alkyl carbocation can be explained by ?

A

inductive effect

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B

hyperconjugation effect

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C

both inductive and hyperconjugation efffect

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D

electromeric effect only.

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Solution

The correct option is B both inductive and hyperconjugation efffect
Carbocation is stabilized by $+ I, + H$ and $+ M$ effect i.e electron releasing inductive effect, hyperconjugation and Mesomeric and Resonance effect.

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Q. In which of the following species hyperconjugation is possible?
Stability of carbocation, alkyl free radical and alkene can be explained on the basis of hyperconjugation. In all these cases there is the presence of hydrogen atom at the adjacent

s p^{2}

hybridised carbon atom. Total no of hyperconjugating structures depends upon the no of hydrogen atoms present at adjacent carbon atom of

s p^{2}

c- atom more the hyperconjugating structure more is the stability of ions.

The greater stability of trans-but-2-ene over cis-but-2-ene can be explained on the basis of hyperconjugation effect.

Q. Which of the following can not be explained by hyperconjugation effect?

Q. Stability of alkyl carbocation can be explained by ?

A carbocation is a group of atoms with a positively charged carbon atom having six electrons in the valence shell after sharing. Carbocations are formed in the heterolysis of a bond and are planar species. Stability of carbocation is determined by inductive effect, hyperconjugation and resonance effect. Greater the number of contributing structures more is the stability of a Carbocation. Electron releasing groups (+I effect) increases the stability of a carbocation whereas the electron withdrawing groups (I effect) have an opposite effect.

Which of the following is most stable carbocation?

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